ntfs: aops: remove VLA usage
authorKees Cook <keescook@chromium.org>
Fri, 17 Aug 2018 22:44:07 +0000 (15:44 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 17 Aug 2018 23:20:27 +0000 (16:20 -0700)
commitac4ecf968acb9e54c335f99d842d56d6b90e28fb
treebfbd2cc93a3d3e1e8de4f2f6df6a248252a8fb9e
parenta10dcebacdb0cf6eb29c211e99cf190cd131a16a
ntfs: aops: remove VLA usage

In the quest to remove all stack VLA usage from the kernel[1], this uses
the maximum size needed on the stack and adds a sanity check for
robustness: index.block_size cannot be larger than PAGE_SIZE nor less
than NTFS_BLOCK_SIZE.

[1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com

Link: http://lkml.kernel.org/r/20180626172909.41453-2-keescook@chromium.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Anton Altaparmakov <anton@tuxera.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/ntfs/aops.c